Flat Parallel Stranded Transmission Line Cable Design
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Solution Overview
Problem
Existing cable designs fail to effectively minimize both inductive and resistive losses while maintaining flexibility and practicality, and they introduce noise and signal skew, limiting their application in high-speed data transmission and audio systems.
Innovation Solution
The use of two or more solid metallic strands laid in a flat parallel configuration within an extruded insulator, stacked and twisted to form stable and flexible conductors, which increases mutual inductance and reduces noise, attenuation, and skew, while maintaining standard manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thick cylindrical conductors are used, then inductive reactance increases, but if thin conductors with large cross-sectional area are used, then manufacturing complexity and handling difficulty increase
Solution Approach 1:
The conductor is segmented into multiple thin parallel strands instead of using a single thick conductor. This segmentation reduces inductive reactance while maintaining manageable flexibility and ease of handling, as each thin strand contributes to the overall current carrying capacity without the excessive inductance of a thick conductor.
Solution Approach 2:
The conductor geometry transitions from a traditional cylindrical cross-section to a flat ribbon-like cross-section with increased width. This dimensional change allows the conductor to achieve low inductance through the flattened geometry while maintaining practical handling characteristics through the balanced aspect ratio of the flat conductor.
2Ease of manufacture
If conventional cable designs are used, then manufacturing is simple, but signal attenuation and noise increase
Solution Approach 1:
The cable incorporates multiple flat conductors segmented into parallel strands, which reduces signal attenuation through decreased inductive reactance and skin effect, while maintaining manufacturing simplicity by using standard extrusion and assembly processes adapted for flat conductor geometry.
Solution Approach 2:
The cable uses composite construction with multiple flat conductors, insulation layers, and shielding in a integrated design that reduces noise and attenuation. The composite structure achieves improved transmission characteristics while remaining compatible with conventional cable manufacturing techniques.
3Length of stationary object
If cable length is increased for longer transmission, then attenuation and skew increase, limiting high-speed data transmission
Solution Approach 1:
The flat conductor design with multiple parallel strands reduces inductive reactance and skin effect, allowing signal transmission over longer cable lengths with acceptable attenuation. The segmented structure maintains signal integrity at high speeds by minimizing frequency-selective loss that would otherwise limit transmission distance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves reduced signal attenuation, noise, and skew, enabling higher-speed data transmission over longer lengths with improved impedance uniformity and flexibility, making it suitable for a wide range of applications without requiring special handling or termination procedures.
Implementation Method 1
The concept of increasing the mutual inductance of a cable to reduce its attenuation was originally disclosed in 1904 by Michael Pupin's U.S. Pat. No. 761,995 for the invention of the telephone loading coil. Essentially, the coils function is to increase the mutual inductance of the two conductors to reduce the inductive reactance of the circuit
Implementation Method 2
The challenge of those designs is to overcome the inherent tendency of thick cylindrical conductors to increase inductive reactance while creating additional frequency selective loss due to 'skin effect'
Data Source
AI summary
A transmission line cable that utilizes a plurality of substantially flat insulated conductors, each consisting of two or more solid metallic strands laid side by side in a parallel configuration within an extruded insulator. The plurality of insulated conductors are stacked into groups of two or more and may be utilized as signal conductors or shield conductors. Once the insulated conductors are stacked, the stack is twisted together, and either wrapped in a conductive insulator, placed in an extruded non-conductive insulator, or both, creating a cable that is stable, flexible, and has improved transmission characteristics, including reduced attenuation, noise and signal skew.